<template>
  <div class="detail">
    <Header/>

    <div class="main">
      <div class="course-info">
        <div class="wrap-left">
          <img src="/static/image/course_demo.png" alt="">
        </div>

        <div class="wrap-right">
          <h3 class="course-name">{{ course.name }}</h3>
          <p class="data">{{ course.students }}人在学&nbsp;&nbsp;&nbsp;&nbsp;课程总时长：{{ course.lessons }}课时/{{course.lessons==course.pub_lessons?'更新完成':`已更新${course.pub_lessons}课时`}}&nbsp;&nbsp;&nbsp;&nbsp;难度：{{course.level_name}}</p>
          <div class="sale-time" v-if="course.active_time>0">
            <p class="sale-type">{{ course.discount_name }}</p>
            <p class="expire">
              距离结束：仅剩
              {{keepformat(course.active_time/86400)}}天
              {{keepformat(course.active_time / 3600 % 24)}}小时
              {{keepformat(course.active_time / 60 % 60)}}分
              <span class="second">{{ keepformat(course.active_time%60) }}</span> 秒
            </p>
          </div>
          <p class="course-price">
            <span>活动价</span>
            <span class="discount">¥{{course.real_price}}</span>
            <span class="original">¥{{course.price}}</span>
          </p>
          <div class="sale-time course-price2" v-if="course.active_time<1">
            <span>价格</span>
            <p class="sale-type discount" style="color:#fff;">¥{{course.price}}</p>
          </div>
          <div class="buy">
            <div class="buy-btn">
              <button class="buy-now">立即购买</button>
              <button class="free">免费试学</button>
            </div>
            <div class="add-cart" @click="addCartHander(course.id)">
              <img src="/static/image/cart-yellow.svg" alt="">加入购物车
            </div>
          </div>
        </div>
        <div class="course_nav">
          <ul class="tab-list">
            <li :class="tabIndex===0?'active':''" @click="tabIndex=0">详情介绍</li>
            <li :class="tabIndex===1?'active':''" @click="tabIndex=1">课程章节 <span class="free_btn">(试学)</span></li>
            <li :class="tabIndex===2?'active':''" @click="tabIndex=2">用户评论 (6)</li>
            <li :class="tabIndex===3?'active':''" @click="tabIndex=3">常见问题</li>
          </ul>
        </div>
      </div>
      <div class="course-content">
        <div class="course-tab-list">
          <div class="tab-item" v-if="tabIndex==0">
            <div class="brief_box" v-html="course.real_brief"></div>
          </div>
          <div class="tab-item" v-if="tabIndex==1">
            <div class="tab-item-title">
              <p class="chapter">课程章节</p>
              <p class="chapter-length">共{{course.chapter_list.length}}章 {{course.lessons}}个课时</p>
            </div>
            <div class="chapter-item" v-for="(chapter, key) in course.chapter_list" :key="key">
              <p class="chapter-title">
                <img src="/static/image/1.svg" alt="">第{{chapter.chapter}}章·{{chapter.name}}
              </p>
              <ul class="lesson-list">
                <li class="lesson-item"  v-for="(lesson, key) in chapter.lesson_list" :key="key">
                  <p class="name">
                    <span class="index">{{chapter.chapter}}-{{key+1}}</span>
                    {{lesson.name}}
                    <span class="free" v-if="lesson.free_trail">免费</span>
                  </p>
                  <p class="time">
                    {{lesson.duration}}
                    <img src="/static/image/chapter-player.svg">
                  </p>
                  <button class="try" v-if="lesson.free_trail">立即试学</button>
                  <button class="try" v-else>立即购买</button>
                </li>
              </ul>
            </div>
          </div>
          <div class="tab-item" v-if="tabIndex==2">
            用户评论
          </div>
          <div class="tab-item" v-if="tabIndex==3">
            常见问题
          </div>
        </div>

        <div class="course-side">
          <div class="teacher-info">
            <h4 class="side-title"><span>授课老师</span></h4>
            <div class="teacher-content">
              <div class="cont1">
                <img src="/static/image/avatar1.svg">
                <div class="name">
                  <p class="teacher-name">{{ course.teacher.name }}</p>
                  <p class="teacher-title">{{ course.teacher.signature }}</p>
                </div>
              </div>
              <p class="narrative" v-html="course.teacher.brief"></p>
            </div>
          </div>

        </div>
      </div>
    </div>

    <Footer/>
  </div>
</template>

<script>
    import Header from "./common/Header"
    import Footer from "./common/Footer"

    // 引入播放器组件
    // import {videoPlayer} from 'vue-video-player';

    export default {
        name: "Detail",
        data(){
            return {
                course:{
                    id: 1, // 课程ID
                },
                tabIndex: 1, // 当前选项卡显示的下标
            }
        },
        created(){
            // 获取路由参数
            this.course.id = this.$route.params.id;
            // 获取课程信息
            this.get_course_data();
        },
        methods: {
            // onPlayerPlay(){
            //     // alert("视频开始播放");
            // },
            // onPlayerPause(){
            //     // alert("视频暂停播放");
            // },
            addCartHander(course_id) {
              //localStorage.token 返回的是一个字符串, 'null'  好坑的，这样布尔判断为true
              // let token = sessionStorage.token || localStorage.token;
              let token = '';
              // if (localStorage.token !== "null") {
              //   token = localStorage.token;
              // }
              // if (sessionStorage.token !== "null") {
              //   token = sessionStorage.token;
              // }
              if (localStorage.token) {
                token = localStorage.token;
              }
              if (sessionStorage.token) {
                token = sessionStorage.token;
              }

              if (!token) {
                this.$confirm("对不起，你还没有登录")
                .then(() => {
                  this.$router.push({
                    name: 'login'
                  })
                })
              } else {
                this.$axios.post(`${this.$settings.Host}/cart/`, {
                  course_id: course_id
                }, {
                  headers: {
                    // 不加上这个，没法通过身份验证
                    "Authorization": "jwt " + token
                  }
                })
                .then(res => {
                  this.$message({
                    message: res.data.message
                  });
                  // total 是购车中所有的商品的数量
                  let total = res.data.total;
                  this.$store.commit("change_total", total);
                })
                .catch(err => {
                    this.$message({
                      message:err.response.data
                    })
                })
              }

            },
            get_course_data() {
                this.$axios.get(`${this.$settings.Host}/course/${this.course.id}/`)
                    .then(res => {
                        let data = res.data;
                        this.course = data;
                    })
                    .catch()

            }
        },
        components:{
            Header,
            Footer,
            // videoPlayer,   //暂时不用，用于视频播放
        }
    }
</script>

<style scoped>
  .main{
    background: #fff;
    padding-top: 30px;
  }
  .course-info{
    width: 1200px;
    margin: 0 auto;
    overflow: hidden;
  }
  .wrap-left{
    float: left;
    width: 690px;
    height: 388px;
    background-color: #000;
  }
  .wrap-left img{
    width: 690px;
    height: 388px;
  }
  .wrap-right{
    float: left;
    position: relative;
    height: 388px;
  }
  .course-name{
    font-size: 20px;
    color: #333;
    padding: 10px 23px;
    letter-spacing: .45px;
  }
  .data{
    padding-left: 23px;
    padding-right: 23px;
    padding-bottom: 16px;
    font-size: 14px;
    color: #9b9b9b;
  }
  .sale-time{
    width: 464px;
    background: #fa6240;
    font-size: 14px;
    color: #4a4a4a;
    padding: 10px 23px;
    overflow: hidden;
  }
  .sale-type {
    font-size: 16px;
    color: #fff;
    letter-spacing: .36px;
    float: left;
  }
  .sale-time .expire{
    font-size: 14px;
    color: #fff;
    float: right;
  }
  .sale-time .expire .second{
    width: 24px;
    display: inline-block;
    background: #fafafa;
    color: #5e5e5e;
    padding: 6px 0;
    text-align: center;
  }
  .course-price{
    background: #fff;
    font-size: 14px;
    color: #4a4a4a;
    padding: 5px 23px;
  }
  .discount{
    font-size: 26px;
    color: #fa6240;
    margin-left: 10px;
    display: inline-block;
    margin-bottom: -5px;
  }
  .original{
    font-size: 14px;
    color: #9b9b9b;
    margin-left: 10px;
    text-decoration: line-through;
  }
  .buy{
    width: 464px;
    padding: 0px 23px;
    position: absolute;
    left: 0;
    bottom: 20px;
    overflow: hidden;
  }
  .buy .buy-btn{
    float: left;
  }
  .buy .buy-now{
    width: 125px;
    height: 40px;
    border: 0;
    background: #ffc210;
    border-radius: 4px;
    color: #fff;
    cursor: pointer;
    margin-right: 15px;
    outline: none;
  }
  .buy .free{
    width: 125px;
    height: 40px;
    border-radius: 4px;
    cursor: pointer;
    margin-right: 15px;
    background: #fff;
    color: #ffc210;
    border: 1px solid #ffc210;
  }
  .add-cart{
    float: right;
    font-size: 14px;
    color: #ffc210;
    text-align: center;
    cursor: pointer;
    margin-top: 10px;
  }
  .add-cart img{
    width: 20px;
    height: 18px;
    margin-right: 7px;
    vertical-align: middle;
  }

  .course-tab{
    width: 100%;
    background: #fff;
    margin-bottom: 30px;
    box-shadow: 0 2px 4px 0 #f0f0f0;

  }
  .course-tab .tab-list{
    width: 1200px;
    margin: auto;
    color: #4a4a4a;
    overflow: hidden;
  }
  .tab-list li{
    float: left;
    margin-right: 15px;
    padding: 26px 20px 16px;
    font-size: 17px;
    cursor: pointer;
  }
  .tab-list .active{
    color: #ffc210;
    border-bottom: 2px solid #ffc210;
  }
  .tab-list .free{
    color: #fb7c55;
  }
  .course-content{
    width: 1200px;
    margin: 0 auto;
    background: #FAFAFA;
    overflow: hidden;
    padding-bottom: 40px;
  }
  .course-tab-list{
    width: 880px;
    height: auto;
    padding: 20px;
    background: #fff;
    float: left;
    box-sizing: border-box;
    overflow: hidden;
    position: relative;
    box-shadow: 0 2px 4px 0 #f0f0f0;
  }
  .tab-item{
    width: 880px;
    background: #fff;
    padding-bottom: 20px;
    box-shadow: 0 2px 4px 0 #f0f0f0;
  }
  .tab-item-title{
    justify-content: space-between;
    padding: 25px 20px 11px;
    border-radius: 4px;
    margin-bottom: 20px;
    border-bottom: 1px solid #333;
    border-bottom-color: rgba(51,51,51,.05);
    overflow: hidden;
  }
  .chapter{
    font-size: 17px;
    color: #4a4a4a;
    float: left;
  }
  .chapter-length{
    float: right;
    font-size: 14px;
    color: #9b9b9b;
    letter-spacing: .19px;
  }
  .chapter-title{
    font-size: 16px;
    color: #4a4a4a;
    letter-spacing: .26px;
    padding: 12px;
    background: #eee;
    border-radius: 2px;
    display: -ms-flexbox;
    display: flex;
    -ms-flex-align: center;
    align-items: center;
  }
  .chapter-title img{
    width: 18px;
    height: 18px;
    margin-right: 7px;
    vertical-align: middle;
  }
  .lesson-list{
    padding:0 20px;
  }
  .lesson-list .lesson-item{
    padding: 15px 20px 15px 36px;
    cursor: pointer;
    justify-content: space-between;
    position: relative;
    overflow: hidden;
  }
  .lesson-item .name{
    font-size: 14px;
    color: #666;
    float: left;
  }
  .lesson-item .index{
    margin-right: 5px;
  }
  .lesson-item .free{
    font-size: 12px;
    color: #fff;
    letter-spacing: .19px;
    background: #ffc210;
    border-radius: 100px;
    padding: 1px 9px;
    margin-left: 10px;
  }
  .lesson-item .time{
    font-size: 14px;
    color: #666;
    letter-spacing: .23px;
    opacity: 1;
    transition: all .15s ease-in-out;
    float: right;
  }
  .lesson-item .time img{
    width: 18px;
    height: 18px;
    margin-left: 15px;
    vertical-align: text-bottom;
  }
  .lesson-item .try{
    width: 86px;
    height: 28px;
    background: #ffc210;
    border-radius: 4px;
    font-size: 14px;
    color: #fff;
    position: absolute;
    right: 20px;
    top: 10px;
    opacity: 0;
    transition: all .2s ease-in-out;
    cursor: pointer;
    outline: none;
    border: none;
  }
  .lesson-item:hover{
    background: #fcf7ef;
    box-shadow: 0 0 0 0 #f3f3f3;
  }
  .lesson-item:hover .name{
    color: #333;
  }
  .lesson-item:hover .try{
    opacity: 1;
  }

  .course-side{
    width: 300px;
    height: auto;
    margin-left: 20px;
    float: right;
  }
  .teacher-info{
    background: #fff;
    margin-bottom: 20px;
    box-shadow: 0 2px 4px 0 #f0f0f0;
  }
  .side-title{
    font-weight: normal;
    font-size: 17px;
    color: #4a4a4a;
    padding: 18px 14px;
    border-bottom: 1px solid #333;
    border-bottom-color: rgba(51,51,51,.05);
  }
  .side-title span{
    display: inline-block;
    border-left: 2px solid #ffc210;
    padding-left: 12px;
  }

  .teacher-content{
    padding: 30px 20px;
    box-sizing: border-box;
  }

  .teacher-content .cont1{
    margin-bottom: 12px;
    overflow: hidden;
  }

  .teacher-content .cont1 img{
    width: 54px;
    height: 54px;
    margin-right: 12px;
    float: left;
  }
  .teacher-content .cont1 .name{
    float: right;
  }
  .teacher-content .cont1 .teacher-name{
    width: 188px;
    font-size: 16px;
    color: #4a4a4a;
    padding-bottom: 4px;
  }
  .teacher-content .cont1 .teacher-title{
    width: 188px;
    font-size: 13px;
    color: #9b9b9b;
    white-space: nowrap;
  }
  .teacher-content .narrative{
    font-size: 14px;
    color: #666;
    line-height: 24px;
  }
  .try a{
    color: #fff;
  }
  .course-price2 span{
    float:left;
    margin-top: 4px;
    color: #fff;
  }
</style>
